Top Descriptors complex sv Changes slider velocity by large amounts in order to test the player's reading ability. , collab A map with two or more associated mappers. , high sv Features prominent high slider velocity usage as a key part of map design. , playfield constraint Restricts object placement to a certain part of the playfield. , slider tech Tests uncommon skills involving sliders, such as heavy use of kicksliders or aim on complex slidershapes. , aim control Patterns with velocity or direction changes which strongly go against a player's natural movement pattern. , alt Colloquial term for maps which use rhythms that encourage the player to alternate notes. Typically distinct from burst or stream maps. , custom skin Utilizes custom skin elements and graphics. , perfect stacks Features perfectly overlapped stacked notes using low stack leniency. , chaotic Unpredictable map design, often testing unusual skillsets.